<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8" />
		<title>盒子模型</title>
		<style type="text/css">
			.box1{/* 边框:大小1px 实线 边框颜色为红色 */
				border: 1px solid red;
			}
		</style>
	</head>
	<body>
		<div class="box1">hello world!</div>
		
	</body>
</html>
